[petsc-users] KSP convergence problem

[Mehrdad H Farahani]

I'm experience a weird convergence problem with bcgsl with both ILU and
GAMG preconditioning. The problem converges normally (at least in the
preconditioned norm), but then kicks out with converged reason = -4. I've
attached the convergence history of the previous time-step which worked and
the timestep which shows problems. Could someone give me an idea on how to
proceed?

Best Regards

-- 
Mehrdad
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